膨胀土与红黏土石灰改性对比试验研究

Comparative laboratory study of lime-treated expansive soil and red clay

为探讨石灰改性膨胀土与红黏土的强度发展规律,以生石灰与消石灰改性的南阳膨胀土与郴州红黏土为研究对象,进行了无侧限抗压、固结快速直剪和固结压缩试验的对比研究。研究发现:在1 a养生龄期内,石灰改性的南阳膨胀土与郴州红黏土无侧限抗压强度与养生龄期的对数基本呈线性关系;按大于最佳含水率3%制样的强度在养生28 d以后高于按最佳含水率制样;生石灰改性效果比消石灰改性效果好,由于矿物成分不同,石灰改性南阳膨胀土的效果比石灰改性郴州红黏土好。

To explore the development law of the strength of lime-treated expansive soil and red clay, the unconfined compression, consolidated quick direct shear tests and consolidation test are carried out to compare the Nanyang expansive soil and Chenzhou red clay modified by quicklime and hydrated lime respectively. The study found that during the one-year curing period of lime-treated Nanyang expansive soil and Chenzhou red clay, the unconfined compression strength is linear with the logarithm of curing age. The strength of the samples with moisture content larger than optimum moisture content for 3%after 28 days curing is higher than that of the optimum moisture content samples. In addition, the modification effect of quicklime is better than the effect of hydrated lime. Due to the different mineral composition, the modification effect of lime-treated Nanyang expansive soil is better than that of Chenzhou red clay.